I can't make any suggestions about where else to get Oni because, as I said, abandonware is not legal, and we have a strict rule about not discussing warez on the forum.
To answer your previous question, Oni was sold in two separate versions, one only for Windows, and the other only for Mac, so if you see any "Win/Mac" listings, the seller is confused and is probably selling a Windows version. The game data is not compatible between the platforms, so you can't just pair the Windows game data with the Mac app.
It would technically be possible to convert the Windows game data to the Mac format, but I've never heard of anyone attempting to comprehensively change the platform of the game data like that (that being said, mods are distributed in a bi-platform format and compiled for the current OS on the fly, so we do this kind of thing all the time on a smaller scale). But it would probably be more efficient to just buy the Windows version, if no Mac version is available, and play it through Wine.
]]>I might even be willing to go to more extreme measures... Any suggestions without being too illegal? Might consider abandonware.
]]>What does that mean? How do I run the game?
It'd be much appreciated if someone could help me, because this is getting frustrating...
Thanks!